most LRX cars series 4 and 5 seem to have the 4.22 ratio. I guess it was
for stop light racing !!
The over drive standard set up is with a 4.22 and you will notice the
big difference in engine revs when you engage OD.
You can also fit the 3.89 to an OD car which reduces revs still further.
Have fun with the OD
In message <000701c0fc80$d537ef00$f5c32fd8@oemcomputer>, Ed Esslinger
> I'm Confused -- My work shop manual (WSM-145 page 23) indicates that the
>standard 1725 Alpine has a 3.89 rear end, with overdrive it's 4.22.
> On page 15 Road speed /Engine speed there is an indication that all
>North American cars had 4.22 rear ends, when you compare the overdrive
>speeds to standard. I hope this is true as I have installed an overdrive. Is
>there any way to tell by serial numbers?-- Ed
>Cool Cat Eddie ,1 S3 GT,3 S4's, 2 S5's, 2 MK1 Tigers
>Deep South Rep TE/AE